macroevolution

Question 1

macro vs micro evo

Answer 1

microevolution - evolution within pop

• adaptive and neutral changes in allele frequencies

macroevolution - evolution above species level

• origination, diversification, extinction

Question 2

greatest amount of diversity is found where?

Answer 2

tropics (near equator)

Question 3

wallace line

Answer 3

north and south of line, species don’t mix

Question 4

rates of origination and extinction (alpha and omega)

Answer 4

a (alpha) - origination rate (new species)

horseshoe (omega) - extinction rate

turnover = number of species eliminated and replaced per unit time

Question 5

3 evolutionary faunas

fauna - animals of a particular region, habitat or period

Answer 5

modern

paleozoic

cambrian

Question 6

adaptive radiation

Answer 6

organisms occupy a new niche in absence of predation

when alpha eclipses omega (origination over extinction)

Question 7

cambrian explosion

Answer 7

invertebrate animals exploded in diversity

Question 8

background vs mass extinction

Answer 8

background extinction rate

• normal rate of extinction
• predictable and steady

mass extinction (6 IN TOTAL)

• statistically significant increase beyond background rate

Question 9

what does the drop and the sudden rise in the graph of mass extinction mean

Answer 9

drop → sudden increase = adaptive radiation due to the niches left bare after the extinction

Question 10

3 permian extinction

Answer 10

lasted 60,000 years

acidification of water, low oxygen in water, increase in earth’s temp

Question 11

5 k-t extinction

Answer 11

k-pg boundary - below boundary line is where we can find the dinosaur evidence

• thick layer made by radium bc of asteroid
• a very bad day :p

Question 12

6 - modern

Answer 12

all us baby
- tigers, we ate that up
- vertebrate extinction increased around after time of industrial revolution
- increase co2 causing increase in temp